insecure memory

[Lorie Obal]

I'm working on installing gnupg and I had a couple of questions.
After running gpg --verify gnupg-1.2.1.tar.gz.sig gnupg-1.2.1.tar.gz.sig

I got: "warning: using insecure memory!"

I also had a question about the MD5 checksum.  While I found the info in 
the howto, the response I got after running it was rather cryptic.  Can 
anyone shed some light on how you know it is correct?

-Lorie